Thank you very much for taking the time to play it, and for the feedback!
I have some ideas about how to increase performance during gameplay, I'll try to optimize it a bit once the rating period is over. I also had a giant issue in the main menu that has halving performance there, that's already fixed in my local project.
About the platforming section, I'm sorry, it caused frustration to a lot of people. I wasn't sure if it was hard or easy, I intended to be an area where players would die once or twice, but no more than that. I know now that it's kind of hard for the developer to gauge difficulty, as I know the best path, but it's something I will try to get better at.
Again, sorry for the frustration, and thank you very much for your kind words!